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US 5,752,492 AGranted
Apparatus for controlling the air-fuel ratio in an internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsYoshihiko Kato, Masahiro Wanibe
Life of this patent
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Abstract
An apparatus for controlling the air-fuel ratio in an internal combustion engine, which quickly responds to a deviation between the actual air-fuel ratio and the target air-fuel ratio in the engine and results in immediate purification of the exhaust gas discharged from the engine.
Claims7
An apparatus for controlling the air-fuel ratio in an internal combustion engine comprising:
- a linear type air-fuel ratio sensor provided in the exhaust system of the engine;
- a means for calculating a target fuel supply amount in response to the engine operating condition, the target fuel supply amount being predetermined so that the air-fuel ratio of the mixture supplied to the engine becomes a target air-fuel ratio;
- a means for correcting learned values, each corresponding to each domain divided into a plurality of sections of the engine operating condition, based on a deviation between an actual air-fuel ratio calculated from the output of the air-fuel ratio sensor and the target air-fuel ratio;
- and
- a means for calculating a fuel supply amount to the engine based on the target fuel supply amount and the learned value respectively calculated by the above means and a feedback correction amount calculated in response to the deviation.
2 more elements
An apparatus for controlling the air-fuel ratio in an internal combustion engine comprising:
- a linear type air-fuel ratio sensor provided in the exhaust system of the engine;
- a means for calculating a target fuel supply amount in response to the engine operating condition, the target fuel supply amount being predetermined so that the air-fuel ratio of the mixture supplied to the engine becomes a target air-fuel ratio;
- a means for correcting learned values, each corresponding to each domain divided into a plurality of sections of the engine operating condition, based on a deviation between an actual fuel supply amount calculated from the output of the air-fuel ratio sensor and the target fuel supply amount;
- and
- a means for calculating a fuel supply amount to the engine based on the target fuel supply amount and the learned value respectively calculated by the above means and a feedback correction amount calculated in response to the deviation.
2 more elements
Dependencies are inferred from the claim text.